Stress fluctuations to identify / evaluate unrecognized active faults

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540489
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Kyoto University
• Principal Investigator: YAMADA Yasuhiro 京都大学, 工学(系)研究科(研究院), 准教授 (20362444)
• Co-Investigator(Kenkyū-buntansha): KYAW Thu Moe 独立行政法人海洋研究開発機構, 海洋掘削科学研究開発センター, 研究開発センター長代理 (10371725) ; TSUJI Takeshi 九州大学, 学内共同利用施設等, 准教授 (60455491)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: テクトニクス / 応力変動 / 坑井検層解析 / モデリング

Outline of Final Research Achievements

We have newly identified several active faults in terms of stress field, around a major earthquake fault zone detected in geophysical seismic dataset, by analyzing borehole images acquired at a drill hole in the Nankai Trough area. Geologic modelling results show that internal stresses of an accretionary prism should be highly fluctuated during its deformation process. These are new and significant understandings to detect ‘stress-active faults’ and the nature of stress fluctuations.

Free Research Field

構造地質学・掘削科学・石油地質学